MR556/MR762 Forward Assist Clamping Sleeve is a small forward-assist retention component identified by SKU 50979313. This page provides neutral identification and compatibility information for the referenced HK model families.
Forward Assist Clamping Sleeve specifications
- SKU: 50979313
- Component type: Forward-assist clamping sleeve
- Referenced families: HK MR556 and MR762
- Category: Upper Receiver Parts
The product appears in the official HK Upper Receiver Parts catalog.
MR556 and MR762 compatibility
The combined model name does not confirm every upper-receiver variation. Sleeve dimensions, forward-assist configuration, and production differences must be checked against manufacturer documentation.
Related pages include the Forward Assist Complete and Forward Assist Pressure Spring. Browse Upper Receiver Parts or Rifle Parts.
Identification considerations
Use SKU 50979313, the assembly name, dimensions, and manufacturer diagrams. Similar sleeves or pins should not be assumed interchangeable.
Safety and professional service
Unload the firearm and separate ammunition before inspection. A qualified gunsmith should confirm compatibility, retention, installation, movement, and safe function using the manufacturer’s procedures.
Common Forward Assist Clamping Sleeve questions
Is this a complete forward-assist assembly?
No. It is identified as an individual clamping sleeve.
Does the name cover all MR variants?
No. Exact upper-receiver configuration must still be verified.
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